to parse the GMP ./configure output and generate part of a makefile.
move all the mpn build stuff into the MD part of the framework, and
update the amd64 port to build all the parts it should.
XXX: amd64 build fails to preprocess redc_1.asm gcd_1.asm mod_1_4.asm,
XXX: so we're using the generic C versions for now.
GNU MP is a library for arbitrary precision arithmetic, operating on signed
integers, rational numbers, and floating point numbers. It has a rich set
of functions, and the functions have a regular interface.
GMP is necessary for GCC >= 4.2.
The MPFR library is a C library for multiple-precision floating-point
computations with exact rounding (also called correct rounding). It is
based on the GMP multiple-precision library and should replace the MPF
class in further releases of GMP.
GCC >= 4.2 requires MPFR.
